1、原因

Magento2.3.5以后，为了安全考虑Magento引入了Csp阻止。

涉及的模块：Magento_Csp

2、解决

方法一、csp_whitelist.xml（推荐解决方案）：

etc/csp_whitelist.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright  Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<csp_whitelist xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Csp/etc/csp_whitelist.xsd">
    <policies>
        <policy id="script-src">
            <values>
                <!--CDN-->
                <value id="cloudflare" type="host">*.cloudflare.com</value>
                <!--Google-->
                <value id="google-analytics" type="host">www.google-analytics.com</value>
                <!--Functions-->
                <value id="trustedshops" type="host">*.trustedshops.com</value>
                <value id="usercentrics" type="host">*.usercentrics.eu</value>
            </values>
        </policy>
        <policy id="style-src">
            <values>
                <!--CDN-->
                <value id="cloudflare" type="host">*.cloudflare.com</value>
                <!--Design-->
                <value id="typekit" type="host">*.typekit.net</value>
                <!--Functions-->
                <value id="trustedshops" type="host">*.trustedshops.com</value>
                <value id="usercentrics" type="host">*.usercentrics.eu</value>
            </values>
        </policy>
        <policy id="img-src">
            <values>
                <!--CDN-->
                <value id="cloudflare" type="host">*.cloudflare.com</value>
                <value id="klarna-base" type="host">https://cdn.klarna.com</value>
                <!--Payments-->
                <value id="paypal" type="host">*.paypal.com</value>
                <!--Video-->
                <value id="vimeocdn" type="host">*.vimeocdn.com</value>
                <value id="youtube-img" type="host">https://s.ytimg.com</value>
                <!--Functions-->
                <value id="usercentrics" type="host">*.usercentrics.eu</value>
            </values>
        </policy>
        <policy id="connect-src">
            <values>
                <!--CDN-->
                <value id="cloudflare" type="host">*.cloudflare.com</value>
                <!--Payments-->
                <value id="paypal" type="host">*.paypal.com</value>
            </values>
        </policy>
        <policy id="font-src">
            <values>
                <!--CDN-->
                <value id="cloudflare" type="host">*.cloudflare.com</value>
                <!--Design-->
                <value id="typekit" type="host">*.typekit.net</value>
                <!--Functions-->
                <value id="trustedshops" type="host">*.trustedshops.com</value>
            </values>
        </policy>
    </policies>
</csp_whitelist>

方法二 开发可用：

禁用这个模块

bin/magento mo:dis Magento_Csp -f